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Subject[PATCH 5/8] blk-mq: export some helpers we need to the scheduling framework
Date
Signed-off-by: Jens Axboe <axboe@fb.com>
---
block/blk-mq.c | 39 +++++++++++++++++++++------------------
block/blk-mq.h | 25 +++++++++++++++++++++++++
2 files changed, 46 insertions(+), 18 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6eeae30cc027..c3119f527bc1 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -167,8 +167,8 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
}
EXPORT_SYMBOL(blk_mq_can_queue);

-static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
- struct request *rq, unsigned int op)
+void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
+ struct request *rq, unsigned int op)
{
INIT_LIST_HEAD(&rq->queuelist);
/* csd/requeue_work/fifo_time is initialized before use */
@@ -213,9 +213,10 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,

ctx->rq_dispatched[op_is_sync(op)]++;
}
+EXPORT_SYMBOL_GPL(blk_mq_rq_ctx_init);

-static struct request *
-__blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op)
+struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
+ unsigned int op)
{
struct request *rq;
unsigned int tag;
@@ -236,6 +237,7 @@ __blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op)

return NULL;
}
+EXPORT_SYMBOL_GPL(__blk_mq_alloc_request);

struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
unsigned int flags)
@@ -319,8 +321,8 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw,
}
EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);

-static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx,
- struct blk_mq_ctx *ctx, struct request *rq)
+void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
+ struct request *rq)
{
const int tag = rq->tag;
struct request_queue *q = rq->q;
@@ -802,7 +804,7 @@ static bool flush_busy_ctx(struct sbitmap *sb, unsigned int bitnr, void *data)
* Process software queues that have been marked busy, splicing them
* to the for-dispatch
*/
-static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
+void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)
{
struct flush_busy_ctx_data data = {
.hctx = hctx,
@@ -811,6 +813,7 @@ static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list)

sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data);
}
+EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs);

static inline unsigned int queued_to_index(unsigned int queued)
{
@@ -921,7 +924,7 @@ static void blk_mq_process_rq_list(struct blk_mq_hw_ctx *hctx)
/*
* Touch any software queue that has pending entries.
*/
- flush_busy_ctxs(hctx, &rq_list);
+ blk_mq_flush_busy_ctxs(hctx, &rq_list);

/*
* If we have previous entries on our dispatch list, grab them
@@ -1135,8 +1138,8 @@ static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx,
list_add_tail(&rq->queuelist, &ctx->rq_list);
}

-static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
- struct request *rq, bool at_head)
+void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
+ bool at_head)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;

@@ -1550,8 +1553,8 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio)
return cookie;
}

-static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
- struct blk_mq_tags *tags, unsigned int hctx_idx)
+void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
+ unsigned int hctx_idx)
{
struct page *page;

@@ -1588,8 +1591,8 @@ static size_t order_to_size(unsigned int order)
return (size_t)PAGE_SIZE << order;
}

-static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
- unsigned int hctx_idx)
+struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
+ unsigned int hctx_idx)
{
struct blk_mq_tags *tags;
unsigned int i, j, entries_per_page, max_order = 4;
@@ -2263,10 +2266,10 @@ static int blk_mq_queue_reinit_dead(unsigned int cpu)
* Now CPU1 is just onlined and a request is inserted into ctx1->rq_list
* and set bit0 in pending bitmap as ctx1->index_hw is still zero.
*
- * And then while running hw queue, flush_busy_ctxs() finds bit0 is set in
- * pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.
- * But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list
- * is ignored.
+ * And then while running hw queue, blk_mq_flush_busy_ctxs() finds bit0 is set
+ * in pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list.
+ * But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list is
+ * ignored.
*/
static int blk_mq_queue_reinit_prepare(unsigned int cpu)
{
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 63e9116cddbd..e59f5ca520a2 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -32,6 +32,21 @@ void blk_mq_free_queue(struct request_queue *q);
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
void blk_mq_wake_waiters(struct request_queue *q);
bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx *, struct list_head *);
+void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
+
+/*
+ * Internal helpers for allocating/freeing the request map
+ */
+void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
+ unsigned int hctx_idx);
+struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
+ unsigned int hctx_idx);
+
+/*
+ * Internal helpers for request insertion into sw queues
+ */
+void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
+ bool at_head);

/*
* CPU hotplug helpers
@@ -103,6 +118,16 @@ static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
data->hctx = hctx;
}

+/*
+ * Internal helpers for request allocation/init/free
+ */
+void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
+ struct request *rq, unsigned int op);
+void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
+ struct request *rq);
+struct request *__blk_mq_alloc_request(struct blk_mq_alloc_data *data,
+ unsigned int op);
+
static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
{
return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
--
2.7.4
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